[Jim Lester]

The user changes to the text customization options persist on the device (ie across books and across boots) - so there isn't much in the way of 'defaults' going on, except for the out of box experience (which does have the Publisher Default button as off).

And Yes, Diap, the change is quite draconian - but if the user wants the content rendered in Trebuchet with text in white and background in black, I feel the content should be rendered in Trebuchet with text in white and background in black. Unfortunately there was sufficient content that was preventing the previous, more cooperative, method of CSS override (on the body/p/div tags), that a more thorough method needed to be used.